Please refer to the drawing located at http://www.pineridge7.com/sw3/images/plan.jpg for reference. My plan is to make a simple rotational device. As the slide is manually pushed the length of the stationary bed the rack assembly will follow the angled 1" rod (slide). The rack assembly will move toward the bed rotating the pinion gear and jack-shaft. I am needing the jack-shaft to make but one complete revolution per every 4 foot of bed travel. The angle of the 1" rod (slide) can be changed and locked into position by the adjustmant rod and T-locks. Is the size and pitch of the rack assembly/pinion gear critical for this rotation per length or will the adjustment rod make the machine flexible enough to use most and rack and pinion that I come across?